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The story begins in 1944, during an air raid on London, where Poirot hears the story of Gordon Cloade, a wealthy man who was killed in a bombing raid. His young widow, Rosaleen, inherits his fortune, angering his family, who depend on Gordon for financial support. Rosaleen, a former actress, and her brother David Hunter, who manages her affairs, become the targets of the Cloade family's suspicions.

The story moves two years later to the village of Warmsley Vale. A mysterious stranger, Enoch Arden, appears and blackmails David, hinting that Rosaleen's first husband, Robert Underhay, may not be dead. Arden is soon murdered, and the investigation reveals complex relationships between the characters: Lynn Marchmont, Gordon's niece, is in a romantic relationship with David, while dealing with the family's financial problems. Poirot, called in to solve the case, investigates the motives and alibis of everyone involved.

Through a series of twists and turns, Poirot discovers that David killed Arden to protect Rosaleen's inheritance, but also that Rosaleen was the victim of David's manipulation. Ultimately, Poirot reveals that Underhay is indeed alive, and David's plan fails. The novel ends tragically, with Rosaleen's death and justice for the murder.